C# File handling

1

Hello!

I've tried to open a open a file for reading with a C# function block but the PLC goes to stop. 

Have someone tried this functionality with a better outcome. I think  I use the correct path because when I am  using the built in file functions in plcnext engineer it works.

I've tried

if(File.Exists("/opt/plcnext/filename"))

{

   //Some simple code

}

 

/Stefan

Eduard PLCnext Team

Hello Stefan,

could you provide me the Output Messages, please (see in /opt/plcnext/logs). 

Please send me also your complete C# FB-Code with In- and Output variables.

Thanks!

-Eduard- 

1

Hi,

Thanks for reply.

The output.log and code is in attached file

/Stefan

Eduard PLCnext Team

Hi Stefan,

please define your OutputString as follows and try to execute the ReadXml() only in initialisation part :

        [Output, DataType("STRING")]
        public IecStringEx FilePath;

 

Please see the Readme.txt in your Project,  and compare the following datatype documentation:

| IEC 61131-3     |  C#

|    STRING         | System.Iec61131Lib.IecStringEx |

Please give me a short Feedback, if the Problem is resolved.

Thanks!

-Eduard-

1

Hi again,

When i change to IecStringEx datatype i get CILG0001 internal error in plcnext

/Stefan

Eduard PLCnext Team

Hello Stefan,

please find the examples for C# FB under following link (see 05_IECString and 08_FileHandling):

https://github.com/PLCnext/CSharpExamples/tree/master/PLCnext_CSharpExamples

Please try only to use the example "08_FileHandling" in your application and give me a short feedback if you can successfully start it or not.

Thanks.

-Eduard-

 

1

Hi,

 

Now I got it to work,

I think the main problem was the cycle time.

The cycle time was 2000 ms but the watchdog is not correlated to that time. When I changed the watchdog it works.

Before I added this post I searched for plc stop information in the controller cockpit but I could not find anything. Is there going to be more information there in the future?

Thanks for all help,

/Stefan

Eduard PLCnext Team

Hello Stefan,

in the future you will find the Status Information in cockpit under "Notifications", please see screenshot below. Additionally you can also find the Informations in   /opt/plcnext/logs/Output.log.

Bets Regards

-Eduard-